JSFiddle - React, Tailwind, and code Playground

JavaScript

var finalData = [];

var gdp = {
        "city": "city",
        "gdp": [],  
    };
    
    var income = {
        "city": "city",
        "income": [],  
    };
    
    var uRate = {
        "city": "city",
        "uRate": [],  
    };

var foo = _.merge(gdp, income, uRate);

finalData.push(foo);
console.log(finalData);